Each Homunculus is named after a sinful trait that dominates them the most. Plus, homunculi are immortal and are masters of an individual element or compound.

Lust: She can use her nails as super slicing weapons. I'm assuming she is some type of metal.
Sloth: Water
Greed: Carbon
Wrath: Well...this guy doesn't have any homunculi powers that I know of, but he does half semi-alchemy abilities thanks to Ed's limbs. Gluttony: Can eat anything. I'm assuming his is acid.
Envy: Can take the form of any human being. he pretty much counts as all that makes up a human body. Vanity: Um...I don't really understand this guy's powers at all.

It's Pride, not Vanity, and Pride has the Ultimate Eye and can anticipate any attack. Sheesh.

I'd have to go with Envy.

-D. M. Jeftinija Pharm.D., Ph.D. -- Yes, I've got two doctorates and I'm arrogant about it, what have *you* done with *your* life?"People who don't care about anything will never understand the people who do." "yeah.. but we won't care.""Legostar's on the first page of the guide. His opinion is worth more than both of yours."--Yeahduff

Also, just so you know, a homonculus is the result of an attempted human transmutation (trying to bring someone back to life).

I think it's a little weird to ask which one you'd be, since everyone seems to be picking them by name, so you may as well ask which Deadly Sin you're most like. If I had to pick powers, though, I'd probably go with Sloth...I've always liked omnimorphic shapeshifting. Plus, immortality is a bonus.

...Yeah, I only follow the manga, and only the English releases (no scanlations, because I generally hate them), so a lot of this is spoiler material for me. And I already had a number of events ruined for me when people who'd watched the series bawled about them to me. T_T

Like Nina! And Hughes, dammit! ...Although with him, you KNEW he was going to die, because he had a family and was happy. Oh, and I had the ending of the anime spoiled for me, too - which, at least, is supposed to be totally different from the manga!

ack, I thought this was talking about Homunculus, the manga. I was all excited and surprised too...anyway, it's a very good horror manga about a guy who has a hole drilled into his skull for money and begins to develope psychic-style powers. Band of hawks is translating it if anybody is interested in reading it.